the last word

When I last left you, the jury was out on the issue of whether the bilinear interpolation downsizing algorithm in Photoshop was the same as the one in Matlab. The jury is back. “Mr. Foreman, have the jury reached a verdict?” “We have, your honor.” “May I hear it?” “The algorithms are wildly different, as… [Read More]

In the two previous posts, I identified some anomalies with Matlab’s implementation of bilinear interpolation downsampling at reduction ratios that are integral powers of two. I also observed smaller, but similar, anomalies with bicubic, Lanczos 2, and Lanczos 3 downsampling. Today I set out to find out if the Photoshop implementations of bilinear interpolation evinced… [Read More]

[Note. The bilinear and bicubic interpolation algorithms referred to in this article are the Matlab implementations. They are different from the Photoshop algorithms of the same or similar names. The Photoshop versions are reported on a few posts further on. Therefore, this post is primarily of academic interest.] In yesterday’s post I reported on the… [Read More]

[Note. The bilinear and bicubic interpolation algorithms referred to in this article are the Matlab implementations. They are different from the Photoshop algorithms of the same or similar names. The Photoshop versions are reported on a few posts further on. Therefore, this post is primarily of academic interest.] It is axiomatic in photography that photon… [Read More]

The show opened on Friday, My big print looked pretty good on the wall: Now we’ll see if it sells. I hope so; I don’t really have a good place for it in the house.